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Gennadij [26K]
3 years ago
11

A. A compound gear train is composed of four gears: E,F,G,H. Gear E has 15 teeth and is meshed with gear F. Gear F has 25 teeth

and shares a shaft with Gear G, which has 18 teeth. Gear G is meshed with Gear H, the output gear. Power is supplied at gear E with 150 ft.lb of torque and is moving at 2000 rpm.
A. Sketch and annotate the gear train described above.

B. The necessary torque output of the system is 600 ft.lb. What should the gear ratio of the system be?
Formula Sub/solve Final answer(3 SF)


C. With a system torque output of 600 ft.lb, how many teeth should gear H have?
Formula Sub/solve Final answer(3 SF)
Engineering
1 answer:
cricket20 [7]3 years ago
5 0

Answer:

What subject is this in?? That would help a lot knowing

Explanation:

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A plate of an alloy steel has a plane-strain fracture toughness of 50 MPa√m. If it is known that the largest surface crack is 0.
Ivahew [28]

Answer:

option B is correct. Fracture will definitely not occur

Explanation:

The formula for fracture toughness is given by;

K_ic = σY√πa

Where,

σ is the applied stress

Y is the dimensionless parameter

a is the crack length.

Let's make σ the subject

So,

σ = [K_ic/Y√πa]

Plugging in the relevant values;

σ = [50/(1.1√π*(0.5 x 10^(-3))]

σ = 1147 MPa

Thus, the material can withstand a stress of 1147 MPa

So, if tensile stress of 1000 MPa is applied, fracture will not occur because the material can withstand a higher stress of 1147 MPa before it fractures. So option B is correct.

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3 years ago
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2 years ago
A group of n Ghostbusters is battling n ghosts. Each Ghostbuster carries a proton pack, which shoots a stream at a ghost, eradic
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Answer:

Using the above algorithm matches one pair of Ghostbuster and Ghost. On  each side of the line formed by the pairing, the number of Ghostbusters and Ghosts are  the same, so use the algorithm recursively on each side of the line to find pairings. The  worst case is when, after each iteration, one side of the line contains no Ghostbusters  or Ghosts. Then, we need n/2 total iterations to find pairings, giving us an P(n^{2} lg n)-  time algorithm.

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3 years ago
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8 0
2 years ago
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The mechanical properties of a metal may be improved by incorporating fine particles of its oxide. Given that the moduli of elas
mojhsa [17]

Answer:

A) Upper bound modulus of elasticity; E = 165.6 GPa

B) Lower bound modulus of elasticity; E = 83.09 GPa

Explanation:

A) Formula for upper bound modulus is given as;

E = E_m(1 - V_f) + E_f•V_f

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E_m = 60 GPa

E_f = 380 GPa

V_f = 33% = 0.33

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E = 60(1 - 0.33) + 380(0.33)

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B) Formula for lower bound modulus is given as;

E = 1/[(V_f/E_f) + ((1 – V_f)/E_m)]

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3 years ago
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